<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<meta name="viewport" content="width=device-width, initial-scale=1.0">
		<title></title>
		<link rel="stylesheet" href="./Bootstrap4.6.1/css/bootstrap.css">
		<script src="Bootstrap4.6.1/js/jquery.js"></script>
		<script src="./Bootstrap4.6.1/js/bootstrap.bundle.js"></script>
		<style>
			div{
				outline: 1px red solid;
			}
		</style>
	</head>
	<body>
		<div class="container">
			<div class="row">
				<div class="col-4">001</div>
				<div class="col-4">002</div>
				<div class="col-md-auto">003</div>
				<div class="col-4">004</div>
				<div class="col-4 order-first">005</div>
				<div class="col-4 order-last">006</div>
				<div class="col-4">007</div>
				<div class="col-4">008</div>
				<div class="col-4">009</div>
				<div class="col">010</div>
				<div class="col">011</div>
				<!-- <div class="col-4">012</div> -->
			</div>
		</div>
	<br><hr><br>
		<!-- 列的偏移 -->
		<div class="container">
			<div class="row">
				<div class="col-2">
					<img class="w-50" src="./img/4.jpg" alt="">
				</div>
				<div class="col-3 offset-7">
					登录--注册
				</div>
			</div>
			<div class="row">
				<div class="col-3">col-3</div>
				<div class="col-4 offset-1">col-4</div>
				<div class="col-3 offset-1">col-3</div>
			</div>
		</div>
	</body>
</html>